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Table 2 EATHE factors considered at different levels in Taguchi method

From: Optimization of operating parameters of earth air tunnel heat exchanger for space cooling: Taguchi method approach

Factor Parameter Level
L1 L2 L3 L4
A Diameter of pipe (m) 0.10 0.15 0.20 0.25
B Length of pipe (m) 30 40 50 60
C Inlet air velocity (m/s) 2 3 4 5
D Inlet air temperature (K) 307.35 311.35 315.35 319.35